yes the hobby has grown in two important ways - first is the incredible actual growth of the hobby reflected across the board by the sudden abundance of new plastic kits from old and new mfgs alike...along with new subject matter as well within each line catalog.
the same is true for balsa and RC kits including the foamies.
Unfortunately the other growth has been the in rising unit costs of most of these products as well as in the peripherals like paints, adhesives, tapes, and similar.
In the short three years or so that I've been running the Heywood Planes channel kits costs have nearly doubled and are still rising. It has caused me to slow down a bit on the balsa kits especially.
Right now the cost of the materials I would typically use to finish just one balsa display kit costs much more than the kit itself.
I can say it has had the effect of making me much more circumspect when it comes to choosing what to buy and reduced how many projects I can afford to build in a fiscal year lol